I think the last symbol should have been / for division instead of the percentage sign.
Then it could be expressed in words as:
“The four elements of this cardinal set of basic arithmetic functions are addition, subtraction, multiplication and division”
But I’m not sure why anyone would want to do this?

This is the addition, subtraction, multiplication, and percentage symbols within the notation of a cardinal set... either this is literally gibberish, or it's simply outside my realm of experience.